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<h3>Authentication Commands and Options</h3>
<img src="pic/alice44.gif" alt="gif" align="left"><a href="http://www.eecis.udel.edu/%7emills/pictures.html">from <i>Alice's Adventures in Wonderland</i>, Lewis Carroll</a>
<p>Our resident cryptographer; now you see him, now you don't.</p>
<p>Last update:
  <!-- #BeginDate format:En2m -->15-Oct-2011  01:00<!-- #EndDate -->
  UTC</p>
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<h4>Related Links</h4>
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<h4>Commands and Options</h4>
<p>Unless noted otherwise, further information about these commands is on the <a href="authentic.html">Authentication Support</a> page.</p>
<dl>
  <dt id=automax><tt>automax [<i>logsec</i>]</tt></dt>
  <dd>Specifies the interval between regenerations of the session key list used with the Autokey protocol, as a power of 2 in seconds. Note that the size of the key list for each association depends on this interval and the current poll interval. The default interval is 12 (about 1.1 hr). For poll intervals above the specified interval, a session key list with a single entry will be regenerated for every message sent. See the <a href="autokey.html">Autokey Public Key Authentication</a> page for further information.</dd>
  <dt id="controlkey"><tt>controlkey <i>keyid</i></tt></dt>
  <dd>Specifies the key ID for the <a
	href="ntpq.html"><tt>ntpq</tt></a> utility, which uses the
    standard protocol defined in RFC-1305. The <tt><i>keyid</i></tt> argument is the key ID for a <a href="#trustedkey">trusted
    key</a>, where the value can be in the range 1 to 65534,
    inclusive.</dd>
  <dt id="crypto"><tt>crypto [digest</tt> <em><tt>digest</tt></em><tt>]</tt> <tt>[host <i>name</i>] [ident <i>name</i>] [pw <i>password</i>] [randfile <i>file</i>]</tt></dt>
  <dd>This command  activates the Autokey public key cryptography
    and loads the required host keys and  certificate. If one or more files
    are  unspecified, the default names are used. Unless
    the complete path and name of the file are specified, the location of a file
    is relative to the keys directory specified in the <tt>keysdir</tt> configuration
    command with default <tt>/usr/local/etc</tt>. See the <a href="autokey.html">Autokey Public Key Authentication</a> page for further information. Following are the options.</dd>
  <dd>
    <dl>
      <dt><tt>digest</tt> <em><tt>digest</tt></em></dt>
      <dd>&nbsp;</dd>
      <dd>Specify the message digest algorithm, with default MD5.  If the OpenSSL library
        is installed, <tt><i>digest</i></tt> can be be any message digest algorithm supported
        by the library. The current  selections are: <tt>MD2</tt>, <tt>MD4</tt>, <tt>MD5,</tt> <tt>MDC2</tt>, <tt>RIPEMD160</tt>, <tt>SHA</tt> and <tt>SHA1</tt>. All 
        participants in an Autokey subnet must use the same algorithm. The Autokey message digest algorithm is separate and distinct from the symmetric
        key message digest algorithm. Note: If compliance with FIPS 140-2 is required,
        the algorithm must be ether <tt>SHA</tt> or <tt>SHA1</tt>.</dd>
      <dt><tt>host <i>name</i></tt></dt>
      <dd>Specify the cryptographic media  names for the host, sign and certificate files.   If this option is not specified, the default name is the string returned by the Unix <tt>gethostname()</tt> routine.</dd>
      <dd><span class="style1">Note: In the latest Autokey version,  this option has no effect other than to change the cryptographic media file names.</span></dd>
      <dt><tt>ident <i>group</i></tt></dt>
      <dd>Specify the cryptographic media  names for the identity scheme files. If this option is not specified, the default name is the string returned by the Unix <tt>gethostname()</tt> routine.</dd>
      <dd><span class="style1">Note: In the latest Autokey version,  this option has no effect other than to change the cryptographic media file names.</span></dd>
      <dt><tt>pw <i>password</i></tt></dt>
      <dd>Specifies the password to decrypt files previously encrypted by the <tt>ntp-keygen</tt> program with the <tt>-p</tt> option. If this option is not specified, the default password is the string returned by the Unix <tt>gethostname()</tt> routine. </dd>
      <dt><tt>randfile <i>file</i></tt></dt>
      <dd>Specifies the location of the random seed file used by the OpenSSL library. The defaults are described on the <a href="keygen.html"><tt>ntp-keygen</tt> page</a>.</dd>
    </dl>
  </dd>
  <dt id="ident"><tt>ident <i>group</i></tt></dt>
  <dd>Specifies the group name for ephemeral associations mobilized by broadcast and symmetric passive modes. See the <a href="autokey.html">Autokey Public-Key Authentication</a> page for further information.</dd>
  <dt id="keys"><tt>keys <i>path</i></tt></dt>
  <dd>Specifies the complete directory path for the key file containing the key IDs, key types and keys used by <tt>ntpd</tt>, <tt>ntpq</tt> and <tt>ntpdc</tt> when operating with symmetric key cryptography.  The format of the keyfile is described on the <a href="keygen.html"><tt>ntp-keygen</tt> page</a>.  This is the same operation as the <tt>-k</tt> command line option. Note that the directory path for Autokey cryptographic media is specified by the <tt>keysdir</tt> command.</dd>
  <dt id="keysdir"><tt>keysdir <i>path</i></tt></dt>
  <dd>Specifies the  complete directory path for the Autokey cryptographic keys, parameters and certificates. The default is <tt>/usr/local/etc/</tt>. Note that the path for the symmetric keys file is specified by the <tt>keys</tt> command.</dd>
  <dt id="requestkey"><tt>requestkey <i>keyid</i></tt></dt>
  <dd>Specifies the key ID for the <a href="ntpdc.html"><tt>ntpdc</tt></a> utility program, which
    uses a proprietary protocol specific to this implementation of <tt>ntpd</tt>. The <tt><i>keyid</i></tt> argument is a key ID
    for a <a href="#trustedkey">trusted key</a>, in the range 1 to
    65534, inclusive.</dd>
  <dt id="revoke"><tt>revoke [<i>logsec</i>]</tt></dt>
  <dd>Specifies the interval between re-randomization of certain cryptographic values used by the Autokey scheme, as a power of 2 in seconds, with default 17 (36 hr).  See the <a href="autokey.html">Autokey Public-Key Authentication</a> page for further information.</dd>
  <dt id="trustedkey"><tt>trustedkey [<i>keyid</i> | (<i>lowid</i> ... <i>highid</i>)] [...]</tt></dt>
  <dd>Specifies the key ID(s) which are trusted for the purposes of
    authenticating peers with symmetric key cryptography.  Key IDs
    used to authenticate <tt>ntpq</tt> and <tt>ntpdc</tt> operations
    must be listed here and additionally be enabled with <a href="#controlkey">controlkey</a> and/or <a href="#requestkey">requestkey</a>. The authentication
    procedure for time transfer requires that both the local and
    remote NTP servers employ the same key ID and secret for this
    purpose, although different keys IDs may be used with different
    servers. Ranges of trusted key IDs may be specified: <tt>trustedkey (1 ... 19) 1000 (100 ... 199)</tt> enables the
    lowest 120 key IDs which start with the digit 1. The spaces
    surrounding the ellipsis are required when specifying a range.</dd>
</dl>
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